ICD-10 Diagnosis Code J21

Acute bronchiolitis

Diagnosis Code J21

ICD-10: J21
Short Description: Acute bronchiolitis
Long Description: Acute bronchiolitis
This is the 2018 version of the ICD-10-CM diagnosis code J21

Not Valid for Submission
The code J21 is a "header" and not valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the respiratory system (J00–J99)
    • Other acute lower respiratory infections (J20-J22)
      • Acute bronchiolitis (J21)

Information for Patients


Bronchial Disorders

When you breathe in, the air travels down through your trachea (windpipe). It then goes through two tubes to your lungs. These tubes are your bronchi. Bronchial disorders can make it hard for you to breathe.

The most common problem with the bronchi is bronchitis, an inflammation of the tubes. It can be acute or chronic. Other problems include

  • Bronchiectasis - a condition in which damage to the airways causes them to widen and become flabby and scarred
  • Exercise-induced bronchospasm - a breathing problem that happens when your airways shrink while you are exercising
  • Bronchiolitis - an inflammation of the small airways that branch off from the bronchi
  • Bronchopulmonary dysplasia - a chronic lung condition in infants, most often premature infants

  • Bronchiectasis (Medical Encyclopedia)
  • Bronchiolitis (Medical Encyclopedia)
  • Bronchiolitis - discharge (Medical Encyclopedia)
  • Bronchopulmonary dysplasia (Medical Encyclopedia)
  • Postural drainage (Medical Encyclopedia)
  • Tracheal rupture (Medical Encyclopedia)


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